I was waiting for my friend to arrive in LV today. We had killed first boss left wing before, well, I had, so I had a very large area completely free of mobs.
So I thought to myself, well wtf, I might aswell just play around a bit. Turned my speed hack to 1,1 and started running back and fourth, then 1,3 (flee speed), 2, 4, 6, 8. After running like 3 minutes I put speed back to 1. Normal speed. You cant imagine how slow that felt! =P Everything was completely slow motion as I had grown accustomed to the 8x speed. Try it yourself =)
And do it inside LV, so you dont get someone "running" in on you. The beast spawning in the middle infront of you needs to be killed!